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Correlating Aggregate Properties and Concrete Rheology to Dynamic Segregation of Self-Consolidating Concrete
Segregation is a common problem in self-consolidating concrete (SCC), which is sensitive to mix proportions such as superplasticizer dosage, as well as the size, volume, and gradation of the aggregate. Dynamic segregation, when coarse aggregate lags behind during the flowing process, is distinguishable from static segregation, when coarse aggregate settles in concrete at rest. In the research reported in this paper, a flow trough and a concrete rheometer were used to study the effects of various aggregate properties and concrete rheology on dynamic segregation of SCC. An equation for the drag force was found useful to understand how various mix proportions and concrete rheology affecting dynamic segregation. Higher paste volume, lower superplasticizer percent by weight of cement, lower slump flow, smaller coarse aggregate, and better gradation may increase dynamic stability. Smaller aggregate size has more significant effect than other aggregate properties. Mixtures with dynamic yield stress less than 50 Pa exhibited severe segregation from both flow trough and visual stability index (VSI) tests. Mixtures with static yield stress of 250 Pa or higher had satisfactory dynamic stability, while mixtures with static yield stress of 100 Pa or lower showed severe dynamic segregation. No clear correlation was observed between concrete plastic viscosity and dynamic segregation.
Correlating Aggregate Properties and Concrete Rheology to Dynamic Segregation of Self-Consolidating Concrete
Segregation is a common problem in self-consolidating concrete (SCC), which is sensitive to mix proportions such as superplasticizer dosage, as well as the size, volume, and gradation of the aggregate. Dynamic segregation, when coarse aggregate lags behind during the flowing process, is distinguishable from static segregation, when coarse aggregate settles in concrete at rest. In the research reported in this paper, a flow trough and a concrete rheometer were used to study the effects of various aggregate properties and concrete rheology on dynamic segregation of SCC. An equation for the drag force was found useful to understand how various mix proportions and concrete rheology affecting dynamic segregation. Higher paste volume, lower superplasticizer percent by weight of cement, lower slump flow, smaller coarse aggregate, and better gradation may increase dynamic stability. Smaller aggregate size has more significant effect than other aggregate properties. Mixtures with dynamic yield stress less than 50 Pa exhibited severe segregation from both flow trough and visual stability index (VSI) tests. Mixtures with static yield stress of 250 Pa or higher had satisfactory dynamic stability, while mixtures with static yield stress of 100 Pa or lower showed severe dynamic segregation. No clear correlation was observed between concrete plastic viscosity and dynamic segregation.
Correlating Aggregate Properties and Concrete Rheology to Dynamic Segregation of Self-Consolidating Concrete
Shen, Lin (author) / Jovein, Hamed Bahrami (author) / Wang, Qian (author)
2015-05-18
Article (Journal)
Electronic Resource
Unknown
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